Rocking mechanism



FIG. 1 is a perspective view of a rocking mechanism showing our new design;

FIG. 2 is a left view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions shown in broken line are not part of the design as claimed. 

CLAIM The ornamental design for a rocking mechanism, as shown and described. 